I'm not sure if this has been addressed yet - But can the flame man not be invincible to the flame whip? Yes, I realize it's fire vs fire, but there's still a whip under that flame. It gets pretty inconvient that you can't whip them. Also, in general, the enemies' invincibility period seems too long. It gets kind of aggravating to hit an enemy multiple times but they just keep going right through it.
I'd also suggest adding several minor save points. You're keeping Simon's Quest's game design, where you respawn right where you died. Getting a game over at Dracula, for example, puts you 2 towns behind. Dying on the stretch around Aljiba is especially tedious, as that town amoung others don't even have churches. Perhaps smaller save statues scatterred around Transylvania can help. Maybe have them not restore health, as a motivation to hike to churches sometimes.
If you're using game maker, draw sprites from the DRAW event. In there, specify to draw sprites from round(x) and round(y). This will fix sprites that look ugly occasionally (such as the lizardmen, or even occasionally Simon). This happens because you probably have them moving at subpixel speeds (2.5, for example) and game maker is attempting to draw them at decimal pixels, resulting in that ugly, stretched look.
The last thing on my mind at the moment are those purple ghosts in Castlevania. They take too many hits, it's pretty unrealistic to fend all of them off without taking damage; especially since they keep stalking you while invincible. On top of that, some of them can spawn directly on you, which is annoying especially since they can damage you before they're fully visible. Using laurels is an option, but since you can't attack while using one, getting through Castlevania still involves some time without them.
You've got a promising game, and I'm not trying to insult it. I personally believe Simon's Quest is pretty flawed. I respect that you're going more for a revamp than a re-imagining, but there are still just some things that are flawed game design that weigh this down. Also, just wanna apologize if any or all of what I've said has been adressed - I haven't been following this game too long.
By the way, for video capture, try CamStudio. It's definately not perfect, and I've never gotten the sound capture to work, but if you tweak the settings right you can get a pretty good picture, and it's not too costing of your RAM. I also have Simon's voice clips from CV: Judgement, if you're looking to replace Richter's.